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Old 03-06-2019   #1
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Random engine misfires

So starting a week or two ago i was travelling on a dual carriageway and had been for the previous 20mile or so. I suddenly noticed my EML come on and of twice. I didnt notice anything while driving so when i got home i checked the codes i had 3 codes:

P0300 multiple misfire
P0301 cylinder 1 misfire
P0304 cylinder 4 misfire.

Shortly after i added some redex petrol system cleaner.

Over the last week i have had only cylinder 4 misfire multiple times and for it to go into safe mode. As i have places to be i pulled over and restarted the car to get past safe mode. I do understand i need to sort this issue fast.

When i got the car in january i replaced the air filter the spark plugs and HT leads. In February i replaced the pre cat lambda sensor.

Today i got my coil pack off for testing and each of the primary circuits were reading 0.8 ohm(haynes manual says it should be 0.5+-10%). I know this isnt within spec but wanted to hear another opinion.

When testing the secondary circuit i couldnt get any readings. I put the car back together as it was getting late and need the car tomorrow but i started it and drove it 5 mile and it drove fine. What am i doing incorrectly?

I have a 61plate punto evo mylife 1.2 8v

Sorry for the length but thought i better off load all i know in the hope i get the best response possible.

TIA Joe
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Old 03-06-2019   #2
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Re: Random engine misfires

Hi.

Not too sure..

But better than it could be..

Was expecting a multiair failure..


thankfully not

Search those codes in the GP section..

Probably a common issue..

Charlie
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Old 05-06-2019   #3
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Re: Random engine misfires

It could be something as simple as am incorrectly gapped spark plug or cheap HT Leads (never ever buy cheap leads)

An intermittent missfire is going to be a nightmare to really pin point.

Best advice is to swap one thing at a time, swap the coil packs around if you can see if the problem moves or goes away. If it’s still in the same place swap plugs with another cylinder. And so on and so forth till something flags up what the problem is.
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Old 07-06-2019   #4
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Re: Random engine misfires

Do these have shimmed valve working clearances? where by the cam shaft has to come out to change the shims?? and when where they last checked gap wise, ( which is a reasonably easy job ???? ), just to rule that out???

Was expecting a multiair failure.. what might that be please as i'm still learning about these cars.......
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Last edited by puntodad19; 07-06-2019 at 10:10.
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Old 08-06-2019   #5
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Quote Originally Posted by puntodad19 View Post
Do these have shimmed valve working clearances? where by the cam shaft has to come out to change the shims?? and when where they last checked gap wise, ( which is a reasonably easy job ???? ), just to rule that out???

Was expecting a multiair failure.. what might that be please as i'm still learning about these cars.......
The modern motors use a hydraulically operated solenoid to inject the combustion mix.

They are fussy about oil..


Youtube has factory info..

Jaguar are rolling out this tech.. to lower emissions
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